Custom storms for Malaysia

The Malaysian
version of MIDUSS has an extra item
in the Hydrology menu to define design storms for use
in Malaysia. Click on this to open the window Storms
(Malaysia).

Follow the prompts
in the yellow box
and select the return period of the storm.

Next you should
define the storm duration. Note that
if the duration is less than 30 minutes you must also
define the 2-year, 24-hour rainfall depth. In this example
the duration is set to 90 minutes.

This map shows
isohyetals of the 2-year, 24-hour rainfall
for West malaysia. It can be opened or closed with the
[Show Map] button.

You can then select
a location from the drop-down list
to load the coefficients for the 5-year storm in this part
of Selangor Province. Clicking on the row copies the four
coefficients to the main window.

Click on the
[Compute Storm] button to calculate
the total storm depth and the maximum rainfall intensity.

To copy the storm
characterstics to MIDUSS Storm command
click on the [Copy] button. The total depth and duration are
copied. Also, the rainfall distribution is defined by a mass
rainfall
distribution file. Here we must use the 120 minute file for
Western
Malaysia. In most cases this will be selected automatically by
MIDUSS.

Finally, click
[Display] on the Storm command window to display
the hyetograph in both tabular and graphical form. Then click the
[Accept] button to adopt this design storm for the remainder
of
the simulation.